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[PATCH] sched: mc/smt power savings sched policy

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sysfs entries 'sched_mc_power_savings' and 'sched_smt_power_savings' in
/sys/devices/system/cpu/ control the MC/SMT power savings policy for the
scheduler.

Based on the values (1-enable, 0-disable) for these controls, sched groups
cpu power will be determined for different domains.  When power savings
policy is enabled and under light load conditions, scheduler will minimize
the physical packages/cpu cores carrying the load and thus conserving
power(with a perf impact based on the workload characteristics...  see OLS
2005 CMP kernel scheduler paper for more details..)

Signed-off-by: Suresh Siddha <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Con Kolivas <[email protected]>
Cc: "Chen, Kenneth W" <[email protected]>
Cc: "David S. Miller" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Siddha, Suresh B 2006-06-27 02:54:42 -07:00 • committed by Linus Torvalds
commit 5c45bf279d
11 changed files with 262 additions and 33 deletions
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5
include/asm-i386/topology.h
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@ -112,4 +112,9 @@ extern unsigned long node_remap_size[];
extern cpumask_t cpu_coregroup_map(int cpu);
#ifdef CONFIG_SMP
#define mc_capable() (boot_cpu_data.x86_max_cores > 1)
#define smt_capable() (smp_num_siblings > 1)
#endif
#endif /* _ASM_I386_TOPOLOGY_H */